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1
Content available remote Distance protection performance under inter-circuit faults on double-circuit transmission line
Bachmatiuk A., Iżykowski J.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 1a
7--11
EN
Performance of distance protection of a double-circuit power transmission line under inter-circuit faults is analysed. A new algorithm for fault-loop impedance measurement designed for such faults is presented. Selected results of evaluation of the developed algorithm and its comparison with the algorithm designed for standard faults are included and discussed.
PL
Przeanalizowano działanie zabezpieczenia odległościowego dwutorowej linii elektroenergetycznej podczas zwarć między torami linii. Zaprezentowano nowy algorytm pomiaru impedancji pętli zwarciowej, przeznaczony dla tych zwarć. Przedstawiono i omówiono wybrane rezultaty testowania opracowanego algorytmu i jego porównania z algorytmem zaprojektowanym dla zwarć standardowych.
2
Content available remote Synteza i powstawanie nanorurek węglowych
Bachmatiuk A., Rummeli M. H.
Przemysł Chemiczny
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2010
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T. 89, nr 8
1037-1042
3
Content available Reversible electron charge transfer in single-wall carbon nanotubes
Costa S., Bachmatiuk A., Borowiak-Palen E.
Polish Journal of Chemical Technology
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2008
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Vol. 10, nr 2
1-4
EN
Single-wall carbon nanotubes (SWCNT) have proved to be very special materials due to their unique electronic properties. Over the last years many scientists have dedicated their research to the study of the these materials as an electronic system. Amphoteric doping effects (n-type and p-type), which can be reversed, became a very popular way of manipulating the optic and electronic properties of carbon nanotubes. In the particular case of SWCNT, the most common and widely used procedure, which changes their properties, is acid treatment applied as a purification procedure. The effect of the addition of this kind of the dopant has been widely studied but not fully understood so far. Here, we present a study, of two kinds of SWCNT, produced within different techniques: (i) chemical vapors deposition and (ii) laser ablation. The main difference between the two types is the diameter distribution of the obtained materials, which is broad in the first technique and narrow in the second. After the acid treatment it is possible to observe a diameter sensitive doping effect on both samples. Resonance Raman spectroscopy, optical absorption spectroscopy (OAS) in UV/Vis/NIR and the Fourier transform middle-infrared (FTIR) spectroscopy have been applied for the characterization of the samples.
4
Content available remote Preparation of ultra-large-scale catalysts for catalytic vapour deposition of carbon nanotubes
Bachmatiuk A., Kaleńczuk R. J., Rümmeli M. H., Gemming T., Borowiak-Palen E.
Materials Science Poland
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2008
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Vol. 26, No. 1
105--111
EN
One of the most important issues in the controlled synthesis of carbon nanotubes is finding a simple way to synthesize the catalyst nanoparticles with a controlled size. The preparation of iron nanoparticles via an organic route has been presented in the paper. The nanoparticles, of the diameter ranging between 9.5 and 31 nm, supported on magnesia, were used as a catalyst in chemical vapour deposition to produce bulk scale carbon nanotubes. Two carbon feedstocks (ethanol and cyclohexane) were examined. In the optimization process, the pyrolysis temperature was varied between 650 st.C and 850 st.C. In this simple approach, no additional carrier gas was used. Multiwalled carbon nanotubes with a very low diameter distribution (19.5-2.5 nm) were fabricated. Their composition was analysed via X-ray diffraction. The samples were characterized by the resonance Raman spectroscopy and high-resolution transmission electron microscopy.
5
Content available remote Characterization of carbon nanotubes by Raman spectroscopy
Costa S., Borowiak-Palen E., Kruszyńska M., Bachmatiuk A., Kaleńczuk R. J.
Materials Science Poland
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2008
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Vol. 26, No. 2
433--441
EN
Application of Raman spectroscopy to analyse carbon nanotubes has been presented. Having a mixture of various carbon nanotube samples, one can easily distinguish, in a quick experiment, presence of singlewalled, doublewalled and multiwalled carbon nanotubes (SWCNT, DWCNT, MWCNT, respectively). The so-called G-line is a characteristic feature of the graphitic layers and corresponds to the tangential vibration of carbon atoms. Another characteristic mode is a typical sign of defective graphitic structures (D-line). A comparison of the intensity ratios of these two peaks gives a measure of the quality of the bulk samples. In addition, there is a third mode, named the radial breathing mode (RBM) which is very sensitive to the diameter of SWCNT and DWCNT. Additional option is application of Raman microscopy for mapping analysis and depth profiling to view the changes of intensity in various directions in the sample.
6
Content available remote Badania nad syntezą i spektroskopową charakterystyką wielościennych nanorurek węglowych domieszkowanych azotem
Bachmatiuk A., Ruemmeli M. H., Borowiak-Palen E.
Przemysł Chemiczny
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2007
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T. 86, nr 9
898-900
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